Item Type: Alcohol Tester Material: ABS Battery Type: 2 x AAA Batteries (need to bring your own) (delivery without batteries) Package List 1 x Alcohol Tester 1 x User Manual The warm up time is about 0 to 15 seconds, which is optional according to the sensor status or environment. It always has a lot of gas and impurities adsorbed on the appearance of the alcohol sensor when the tester is first taken out of the package. Or after the tester has not been used for a long time, it needs more time to clean and warm up the sensor, you should press the power button and try again several times if possible. 1Portable and Compact: The alcohol tester has a portable design, which can be kept with your keyring, handbag, purse or belt hook 2Backlight Design: The digital alcohol tester has a backlight design, which helps you see the readings clearly 3Easy to Use: The portable alcohol tester is easy to use, which is used directly, and the settings are not complicated 4ABS Material: The battery powered alcohol tester is made of ABS material, which is wear resistant and durable, and has a long service life 5Pay Attention: When you take the tester out of the package for the first time or do not use the tester for a long time, there is always a lot of gas and impurities on the appearance of the alcohol sensor. You should press the power button and try again several times